1642123 has 4 divisors (see below), whose sum is σ = 1876720. Its totient is φ = 1407528.

The previous prime is 1642117. The next prime is 1642141. The reversal of 1642123 is 3212461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1642123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1642123.

It is not an unprimeable number, because it can be changed into a prime (1642153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117288 + ... + 117301.

It is an arithmetic number, because the mean of its divisors is an integer number (469180).

2^1642123 is an apocalyptic number.

1642123 is a deficient number, since it is larger than the sum of its proper divisors (234597).

1642123 is an equidigital number, since it uses as much as digits as its factorization.

1642123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234596.

The product of its digits is 288, while the sum is 19.

The square root of 1642123 is about 1281.4534716485. The cubic root of 1642123 is about 117.9782349975.

Adding to 1642123 its reverse (3212461), we get a palindrome (4854584).

The spelling of 1642123 in words is "one million, six hundred forty-two thousand, one hundred twenty-three".